Drafting instrument.



P. J. OSTRINGER. DRAFTING INSTRUMENT. APPLICATION FILED JAN. 25, 1912 Patented Sept. 22,1914.

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P. J. O STRINGER. DRAFTING INSTRUMENT. APPLICATION FILED JAN. 25, 1912.

Patented Sept. 22, 1914. 6'

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line 33 in Fig.1. Fig, l is a plan view of the instrument adapted for drawing radiali specification.

UNITED STATES PAT NT, oFFroE.

PAUL J. OSTRINGER, OF SCI-IENECTADY, NEW YORK.

nnnrrrne INSTRUMENT.

specification of Letters Patent Patented Sept. 22,1914.

Application filed January 25, 1912. Serial No. 673,294.

T0 all whom itmag concern:

Beit known that I, PAULJ. OSTRINGER, a

citizen of the United States, residing at Schenectady, county of Schenectady, and

State of New York, have invented certain new and useful Improvements in Drafting Instruments, ,of which the following is a The invention relates to such improvements and consists of the novel construction andcombination of parts hereinafter described) and subsequently claimed.

Reference may be had to the accompany .ing drawings, and the, reference characters marked thereon, which form a part of this specification. Similar characters refer to similar parts in the severalfigures therein.

Figure 1 of the drawings is a plan view of my improved drafting-instrument Fig. 2 is a cross-section of the same taken on the broken line 2-2 in Fig. 1. Fig. 3 is a cross section of the same taken on. the broken lines. Fig. 5 is a vertical cross-section of the same taken on the broken line 5-5 in Fig. 4E. Fig. 6 is'aplan view of a draftinginstrument embodylng my invention 1n .modified form. Fig. 7 is plan view of a corner of the triangle adapted to receive the adjustable pivot-pin. V i p The principal object of the invention is to provide a straight edge with means whereby it can be readily employed as a section-liner adapted for ruling parallel lines any given distance apart. i

, Other-objects will appear in connection with the following description. r

In carrying out my invention, I rotatively mount upon the. straight edge a bearingframe carrying wheels rotatively mounted in parallel planes, a plurality of said wheels projecting beyond the plane or surface of the straight edge to ride upon the drawingboard or paper and one or more of said wheels having teeth for indicating the progressive movement of the instrument. 1 'Such van instrument s capable of many uses by the draftsman, and by rotativfely adjusting the bearing-frame upon the straight edge to cause the wheels to travel at a greater or less angle to the line of the straight edge,

a uniform progressive movement of the.

wheels canbe made to advance the straight edge a predetermined greater or less dis tance as des red,

Referringto the drawings wherein theinvention is shown in preferred form, 1, represents the straight edge, which may be of any known form, being shown in the con venient formof a triangle, of which "the long side, .2, may for the purposes of this descriptionbe considered the line of'ruling edge The triangleis formed with a circular opening, 3, within which is rotatively mounted a bearing-frame, 4L, having bearings for'the horizontal shaft, 5, upon which are mounted spur-wheels, 6, 6, as shown in Fig. 1.

The wall of the opening, 3, is formed with a circumferential rib, 7, and the bearing-frame is shown formed of two plates, 4 and 4 which embrace theribbed edge, 7, as shown in Fig. 2. The plates, 4: and 4; are'secured together by rivets, 8, which cause their edges to embrace the ribbed edge, 7 while permitting said plates .to slide freely along said rib, while at one point said plates, 4? and Pi areprovided with a screw, 9,and nut, l0, whereby they can be clamped tightly upon the ribbed edge, 7, to lock the bearing-frame in fixed relation to the straight edge or triangle.

The wheels, 6, 6, as shownin Figs. 1 and 3, are formed with peripheral teeth or spurs adapted to travel along the drawing-board or paper with a step-by-step progressive.

movement, which is readily detected by the hand of the draftsman; and, when the wheels rest with two neighboring teeth on each wheel in engagement with the board or paper, the instrument will rest in a stable,

position. The spurs or teeth on the wheels,

6, are preferably spaced apart in conformity with some ordinary unit of measurement.

For use as a sectlon-llner for rul ng lines a distanceapart equalto the distance between neighboring teeth on the wheels, 6, or a multiple of said distance between teeth, the bearing-frame is looked to the triangle with the shaft, 5, parallel with the line or edge, 2,

and the instrument is placedupon the drawing-board or paper with the edge, 2, extending parallel with'thedesired direction of the section-lines. The instrument is then moved along the board or paper by the hand of the draftsman, at each movement one or more steps for each successive line to be ruled, said steps representingthe distance between neighboring teeth on the wheels, 6, and being readily recognized by the touch of the draftsman. It will be understood that by adjusting the bearing-frame so that the shaft, 5, will extend at more or less of an angle to the ruling-edge, 2, the same step-bystep movements of the wheels, 6, will cause the instrument to travel more or less 01)- liquely to the line of its edge, 2, so that the progressive or advance movement of the rul- '1ngedge, 2, will be less than that of the i be provided with graduated scales, as shown or angular movement is to one'of the scales 11 at, 11 and 12, whereby the angular movements 'of the bearing-frame and shaft, 5, can be measured. One of said scales, as the scale, 11, on the body of the triangle, is preferably laid out in equal subdivisions of a circle, as degrees.

Another'use of the instrument is to facilitate the ruling of oppositely and equally inclined lines such as those representing the sides of a tapered figure. For such use, the instrument having the shaft, 5, parallel with the edge, 2, is placed with said edge, 2, parallel with the center line of the tapered figure, and the triangle is then rotated upon the bearing-frame until said edge, 2, is inclined to the desired degree for one side of the figure, and the degree of this rotative noted byreference or 12. With the triangle locked in this adjusted position upon the bearing frame, the instrument is used for ruling one of the inclined sides of the figures. The triangle is then released from the bearing-frame and rotatively moved thereupon in the reverse direction until it is inclined to acorresponding degree, as indicated by the scale, 11 or 12, whereupon it is again locked to the bearing-frame and used for ruling the opposite side of the tapered figure.

I have shown the bearing-frame provided with a graduated edge, 13, extending through the axis upon which the bearingframe rotates, whereby the instrument is adapted to facilitate subdividing the space between two parallel lines into any desired number of equal spaces. For this purpose the scale along the edge,-13, corresponds with the spacing of the teeth on the wheels, 6, and the instrument is arranged obliquely across the space between the parallel lines at such an angle that two points in the scale, '13, will lie upon the respective parallel lines, which points shall be separated by a number of spaces in the scale, 18, the same as, or a multiple of, the number of subdivisions-desired. The triangle is then rota- I tively adjusted upon the bearing-frame with its edge, 2, coincident with one of said lines, whereupon the progressive step-by-step movement of the instrument will enable the draftsman to readily make the required subdivision, the subdivisions being indicated by one or more steps of the wheels as the case may be.

In Figs. 4: and 5, I have shown the instrumentadapted for drawing radial lines.

a shouldered pivot-pin located atone coredge, 2, thereof, which pin is adapted to hold that corner of the triangle sufiiciently above the surface of. the drawingboard or paper to permit the nearer. of the wheels, 22, to clear said surface, the triangle being adapted to ride upon the more remote of the wheels, 22, in its circular movement about the pivot-pin. I have shown the shouldered pivot-pin, 15, formed or fixed upon a spring-plate, 16, pivoted at, 17, upon an inclined top-surface l8, on the body of out of which the inner end of the plate, 16, can be sprung, and whereby the plate can be yielding held with its pointed end extended to engage the drawing-board or paper, or with its pointed end extended invardly and raised the triangle. By extending the pointed end of the plate, 16,- and inserting th e same in .the drawing boarcl or paper at the center of a circle, 20, the triangle can be caused to traverse a circular path around the center of the circle by a step-by-step movement, and can thus be usedffor the drawing of radial lines, or for laying off portions of the ranged with the shaft, 5, in line with the is indicated by the toothed wheel 23 and click 24, as hereinafter set forth.

As shown in Fig. 1, the step-bystep movement is indicated by spurs or teeth on'the same wheels upon which the instrument travels.

strument is adapted to travel, and I have shown fixed upon said shaft, 5, a toothed wheel, 23, adapted to be engaged by ayclick, 24, whereby the step-by-step movement of the instrument is indicated, the diameter .of the wheel, 23, being smaller the wheels, 22, whereby it is adapted to clear the surface of the drawing-board or paper. 1 7 p In Fig. 6 I have shown fixed upon the shaft,5, a pair of wheels, 22, 22, upon which third toothed wheel, 25, mounted .upon the For such use the instrument is provided with the triangle, said inclined surface being formed with aseat or recess, 19, into and above the top-surface of circumference of the circle. In this use of the instrument, the bearing-frame 1S ar-' In Fig. 4:, I have shown fixed upon the shaft, 5, wheels, 22, '22, upon which the inthan that of i ner of the triangle in .line with the ruling- I pivot-pin 15, and the step by step movement I the instrument travels, and I have shown a I which engage thesurface over which the in-I remote from the ruling edge.

bearing-frame, 26, parallel with the wheels, 22, 22, and also adapted to travel along the surface of the draWing bOard or paperto indicate the step-by-step movement of the instrument. j i

For certain purposes of the invention, the bearing-frame may be rotatively mounted in any known edge.

In the preferred form of my invention, the spacing teeth are formed on the wheels strument is moved, and these toothed Wheels are located at an intermediate point between the ruling edge and the portion of the body of the instrument which is most In the use of the instrument it is held and moved along the supporting surface by pressure of the tips of the fingers upon the body-of the instrument adjacent to the ruling edge, and pressure of the thumb upon the portion of the body of the instrument most remote "from the ruling edge,and on the opposite side of the toothed wheels from the ruling ed e. and falling movement due to'the teeth on the wheels is increased and accentuated at the point of the instrument engaged by the thumb and most remote from the ruling edge. If the ruling edge be thus held against the supporting surface as the instrument is moved thereover, the users thumb will be raised and lowered to a considerable degree more than the axis of the wheels, thus enabling the user ,to more readily detect the step-by-step progress of the instrument. I

What I claim as new and desire to secure by Letters Patent is I a 1. In a drafting-instrument, and in com.- bination, a straight-edge; a bearing-frame rotatively mounted upon said straight-edge; a shaft rotatively mounted upon said bearing-frame; a pair of wheels mounted upon said shaft. projecting slightly beyond the lower face of salidstraight-edge; means for securing said bearing-frame in fixed angular relation to said straight-edge and a shouldered pivot-pin adapted to be removably located at one end of the straight-edge in line with its ruling-edge, and to support said end in an elevated position in which the nearer of said wheels will clear the sur- 2. In a drafting-instrument, and in combination, a straight-edge having at one end an inclined surface providedwith,a. se'at; a bearing-frame rotatively mounted upon saidv straight-edge; a shaft rotatively mounted upon said bearing frame; a pair manner upon the straight It will. thus be seen that the rising of wheels mounted upon said shaft projecting slightly beyond the lower face of said straight-edge; means for securing said bearing-frame in fixed angular relation to said straight-edge; a spring-plate pivoted upon said inclined end of the straight-edge, and adapted to be sprung into and out of said seat; and shouldered pi-votpin carried by said spring-plate adapted in one position of said plate to project below the lower face of said straight-edge in line with its ruling-edge, and in another position of said plate to be supported above the upper face of said straight-edge. Y

3. In a draftinginstrument, and in combination, a straight-edge; a bearing-frame rotatively mounted upon said straight-edge;

shaft rotatively mounted upon said bearingframe; and a plurality of wheels fixed upon.

said shaft projecting slightly beyond the lower face of said straight-edge, said instrument having toothed mechanism for indicating' step by step the movement of the instrument on said wheels, said bearingframe having a straight edge extending through the axis of the bearing-frame and graduated to correspond with the. spacing of said toothed mechanism.

a. In a drafting instrument, and in combination, a body having a ruling-edge, a bearing frame rotatively mounted upon said body, a plurality of wheels rotatively mounted in parallel planes upon said bearing frame and projecting slightly below the lower face of said body, said wheels having substantially V-shaped teeth arranged, those of one wheel opposite those of another wheel, respectively, and adapted to indicate step by step the progressive movement of the in strument, and means associated with said body adapted to hold a portion of the same relatively stationary whereby the entire remainder of the bodyis adapted to swing around said stationary portion.

5. In adrafting instrument, and in combination, a body having a ruling edge, a

bearing frame rotatively mounted in said body,a shaft rotatably mounted upon said bearing frame, a wheel mounted on said shaft projecting slightly below the lower face of said body, a pivot pin mounted on thebody adapted to project below the same, said. bearing frame being adapted to be turnedinto register longitudinally with said pivot pin, and means on said instrument for indicating the step by step movement of the instrument around said pivot on said wheel.

6. A drafting instrument comprising a body having a ruling-edge and a pointed end, said body having a raised inclined surface at the pointed end, a pivot pin mounted upon the raised surface of said body and adapted to project below the lower face of the body, said body having a depression in one end of the raised surface adapted to yield 1n the body'an alinement With frame ad ustably mounted adapted to be moved into ingly receive one end of the pivot, a bearing said pivot pin, and a toothed Wheel mounted upon said bearing frame and adapted for engagement upon a supporting surface Wherebyto impart a step by step movement to said body around said pivot.

7. In a drafting instrument, and in combination, a body having an edge of the de-. SlI'GCl contour, a bearing frame rotatlvely mounted in said body, a shaft rotatively mounted upon said bearing frame, a pair 'of Wheels mounted upon said shaft, said Wheels being adapted to project slightly below the lower face of'saidbody, a pivot pin adapted to project below the lower face of said body, and means for securing said bearing frame in fixed angular relation to said body and in line With said pivot pin, said pivot pin being adapted to support one of said Wheels clear lower face of said body, said instrument having tooth mechanism @for indicating step by step the movement of the instrument on said Wheels, said bearing frame having a graduated straight-edge extending through the axis of the bearing frame.

In testimony whereof, I have'hereunto set my hand this 6th day of January, 1912.

PAUL J. OSTRINGER. lVitnesses J. E. 'DONSBAoH,

B. A. LEDUo. j l

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, D. C. p 

